Had a similar experience.
wanted the whole bolt,clerk said"this just came in this morning nothing cut off this bolt so it is the full 20 yds"
"So I won't bother taking it all off the bolt and rewrapping."
no problem paid for the 20yds and left
well get home and start unrolling and cutting only to find that there are only 12 yds on the bolt!
Owners response" how do we know you didn't cut some off?"
lost my business!
some of the LQS should close!